hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 231

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

6.11
In user mode, the flash memory will operate in either of the following states:
• Normal operating mode
• Power-down operating mode
• Standby mode
Table 6.23 shows the correspondence between the operating modes of this LSI and the flash
memory. In subactive mode, the flash memory can be set to operate in power-down mode with the
PDWND bit in FLPWCR. When the flash memory returns to its normal operating state from
power-down mode or standby mode, a period to stabilize the power supply circuits that were
stopped is needed. When the flash memory returns to its normal operating state, bits STS2 to
STS0 in SYSCR1 must be set to provide a wait time of at least 20 µs, even when the external
clock is being used.
Table 6.23 Flash Memory Operating States
LSI Operating State
Active mode
Subactive mode
Sleep mode
Subsleep mode
Standby mode
Watch mode
The flash memory can be read and written to at high speed.
The power supply circuit of the flash memory is partly halted and can be read under low power
consumption.
All flash memory circuits are halted.
Power-Down States for Flash Memory
PDWND = 0 (Initial value)
Standby mode
Standby mode
Normal operating mode
Power-down mode
Normal operating mode
Standby mode
Flash Memory Operating State
Rev. 7.00 Mar 10, 2005 page 189 of 652
PDWND = 1
Normal operating mode
Normal operating mode
Normal operating mode
Standby mode
Standby mode
Standby mode
REJ09B0042-0700
Section 6 ROM